Comparing simple methods for measuring phosphate sorption by soils

被引:18
作者
Allen, DG
Barrow, NJ
Bolland, MDA
机构
[1] Chem Ctr WA, Perth, WA 6004, Australia
[2] Univ Western Australia, Fac Agr, Nedlands, WA 6907, Australia
[3] Agr Western Australia, Bunbury, WA 6230, Australia
来源
AUSTRALIAN JOURNAL OF SOIL RESEARCH | 2001年 / 39卷 / 06期
关键词
phosphate; adsorption isotherm; sorption indexes;
D O I
10.1071/SR00078
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Phosphate sorption curves were measured for 103 Western Australian soils sampled from farmers' fields. A measure of phosphate buffering obtained from a fitted curve was compared with indexes obtained from single-point measurements of phosphate sorption. The single-point indexes were adjusted for the phosphate present in the sampled soils by adding the phosphate extracted by the bicarbonate reagent to the measured sorption. Iron and aluminium extracted by an oxalate solution were measured as indirect indexes. The single-point indexes were closely correlated with the values obtained from the sorption curve. Their correlation was much larger than that of indirect measures.
引用
收藏
页码:1433 / 1442
页数:10
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